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T a >E • Groundwater Monitorir�ta and Analytical Results - Chevron Service Station 49-0557 ' 139 South Center Street Stockton,California EXUANATTONS: Groundwater monitoring data and laboratory analytical results prior to May 17,2000,were compiled from reports prepared by Blaine Tech Services,Inc. TOC=Top of Casing SPHT=Separate-Phase Hydrocarbon Thickness (ppb)=Parts per billion (ft.)=Feet TPH-G=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected GWE=Groundwater Elevation B=Benzene --=Not Measured/Not Analyzed (msl)=Mean sea level T=Toluene QA=Quality Assurance S.I.=Screen Interval E=Ethylbenzene (ft.bgs)=Feet Below Ground Surface X=Xylenes DTW=Depth to Water MTBE=Methyl tertiary butyl ether * TOC elevations are based on City of Stockton Benchmark No.28. Survey was performed by Morrow Surveying on 10101/01. ** GWE was corrected for the presence of SPH; correction factor:[(TOC-DTW)+(SPHT x 0.80)]. Fecal coliforms measured in organisms per 100 milliliters(ml). z Chromatogram pattern indicates an unidentified hydrocarbon. a Oxygenates by EPA 8260 and Methanol by EPA 8015 were not detected; see lab report for detection limits. Oxygenates by EPA 8260 were not detected; see lab report for detection limits. 5 Laboratory report indicates unidentified hydrocarbons C6-C 12. Laboratory report indicates weathered gasoline C6-C12. 7 Laboratory report indicates gasoline C6-C 12+unidentified hydrocarbons<C6. R Laboratory report indicates gasoline C6-C12. 9 Laboratory report indicates constituents were analyzed by EPA Method 8260. 10 Well development performed. 4I MTBE by EPA Method 8260. 12 Data provided by Secor International,Inc. Samples were collected prior to initiation of ozone sparging(baseline samples). Wells were not purged prior to collection of samples. i I 9-0557.x1s/#386843 17 As of 04116/02